Lapho amaviki angu-21 ekhulelwe, i-anatomy ye-fetus isifana nesakhiwo somntwana ngemuva kokuzalwa. Usenayo zonke izitho zangaphakathi nezinhlelo, futhi esikhathini esizayo kuphela ukuthuthukiswa nokukhula kwabo kuzokwenzeka. Ngakho-ke amasonto angu-21 - isikhathi sokuphela kokuhlolwa kwesibili kwe-ultrasound - isifundo lapho zonke izitho ze-fetus zivivinywa khona ukuba khona kwezinkinga zokuzalwa ezingenayo.
Iviki lokukhulelwa 21 - ukuthuthukiswa kwe-fetus
Emasontweni angama-21 okukhulelwa, isisindo nobukhulu be-fetus akuvamile ukuthi kulinganiswa ukuhlolwa - lezi zikhombisi ezingafundile kakhulu, nakuba ubude bomzimba bufinyelela ku-18 cm kanti isisindo singaphezu kuka-300 g.
Kuze kube yileso sikhathi, owesifazane kufanele azwe ukunyakaza kwesisu , uma emasontweni angama-21 engakafiki-lokhu kungabangela ukukhathazeka.
Isonto 21 - ukulinganisa ubukhulu bomntwana
Emasontweni angu-21, ngokusho komthetho, cishe wonke amathambo, izitho zangaphakathi kanye namasayizi akhethekile we-fetus alinganiswa. Ubukhulu bokuqala bokubuthwa ebusweni ngeviki 21 yi-biparietal (51.6 mm phakathi kwamathambo amabili angokwemvelo), ubukhulu besibili be-skull yi-frontal-parietal (64 mm), kanti isakhiwo sobuchopho sifana nesesana esisha.
Ngeviki 21, wonke amathambo we-tubular ayalwa, ngenkathi:
- ubude bethanga - 35.3 mm;
- Ubude be-humerus - 33.5 mm;
- Ubude be-tibia - 31.7 mm;
- ubude bamathambo wesiphambano singama-29.5 mm.
Ububanzi besifuba emavikini angu-21 buyi-46.4 mm, ubukhulu benhliziyo yesisu buyi-21.2 mm ububanzi, ubude buka-21.5 mm ubukhona, kukhona wonke amakamelo enhliziyo, ukusikeka kwayo, ngesilinganiso sika 120-160 ngomzuzu.
Ububanzi obuphakathi kwesisu emavikini angu-21 buyi-52.5 mm, isisu sibonakala ngokucacile, amaconsi emathumbu awagculwanga, udonga lwangaphakathi lwesisu lomzimba luphelele.
Zombili izinso zibonakala zize zifinyelele ku-20.3 mm ubude, 11.1 mm ngaphesheya, izitsha nezindebe azihlanjululwa, isisindo sincane, sisesikhungweni esincane, ngemuva kokuvuthwa kwe-fetus, cishe ayibonakali.
I-fetus ngesonto 21 lokukhulelwa
Isikhundla se-fetus ngokuvamile siyinhloko, kodwa noma ngabe i-gluteal, ngalesi sikhathi ingane ingashintsha phakathi nosuku esibelethweni, ngakho-ke, kuze kufike amasonto angu-30 okukhulelwa, akufaneleki ukukhathazeka ngakho.
I-placenta iyinhlanganisela, ububanzi obuyi-25.6 mm, ubukhulu bekholomu ye-amniotic fluid endaweni engenamalungu emfusus kusuka ku-35 kuya ku-70 mm. Umlomo wesibeletho uvaliwe ngalesi sikhathi.